Wrought iron is an iron alloy with very low carbon content (less than 0.08%) with respect to cast iron (2.1% to 4%). The microstructure of wrought iron shows dark slag inclusions in ferrite. It is soft, ductile, fibrous variety that is produced from a semifused mass of relatively pure iron globules partially surrounded by slag. It usually contains less than 0.1 percent carbon and 1 or 2 percent slag. Wrought iron is magnetic, corrosion-resistant and easily welded. It has high elasticity and tensile strength. It can be heated and reheated and worked into various shapes. Wrought iron is no longer produced on a commercial scale. The modern functional equivalent of wrought iron is mild steel, also called low-carbon steel. Many products described as wrought iron, such as guard rails, garden furniture and gates, are actually made of mild steel. For example, the Eiffel Tower is a wrought-iron lattice tower.
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